BoilerFaultCodesPotterton E85752 Fault Code
The Potterton E85752 fault code means: your boiler is struggling to direct hot water to your taps or radiators because a mechanical internal valve has stuck or failed.. It appears on 1 Potterton model in our database.
Technical description: 3 Way Valve Assembly (Body, ‘O’Rings, Clips & key no.13)
What causes the Potterton E85752 fault?
This fault occurs when the mechanical valve responsible for switching water flow between your heating and your taps becomes seized due to a buildup of debris or internal wear. The most common reason is sludge within the system water causing the valve to stick, which eventually prevents the motor from being able to move it into the correct position.
This issue often becomes apparent in autumn when homeowners switch their central heating back on for the first time after the summer months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Potterton models that show the E85752 fault code
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Source
Potterton E85752 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026